JP7187376B2 - circuit breaker for wiring - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring circuit breaker installed, for example, in a distribution board.

Conventionally, as a circuit breaker for wiring used in a single-phase three-wire electric circuit, load-side terminals composed of a plurality of quick-connecting terminals are arranged on the front surface of the main body case, and power-side terminals are arranged on the rear surface. A thin body case has been devised in which quick-connect terminals are arranged in a vertical line on the front surface of the main body case. In such circuit breakers, it is desirable to provide a cover member for covering the unused quick-connect terminals in order to prevent erroneous connection. Therefore, for example, in the invention described in Patent Document 1, support walls extending along the parallel direction of the quick-connect terminals are provided on the front surface of the main body case on both left and right sides of the quick-connect terminals, and quick-connect terminals are provided between the support walls. A desired quick connect terminal is covered by attaching a cover member for covering/exposing the terminal and sliding the cover member along the support wall.

JP 2007-287582 A

However, if a pair of support walls extending along the parallel direction of the quick-connect terminals is provided on the front surface of the main body case, if a structure for sliding the cover member is provided on the front surface of the main body case, the quick-connect terminals, for example, will not be able to move. There is a risk that the support wall will get in the way when inserting the load wiring.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wiring circuit breaker that does not require a structure for sliding a cover member on the front surface of a main body case.

In order to achieve the above object, according to the first aspect of the present invention, a handle for opening and closing an electric circuit is provided on the upper surface of a main body case, and a power supply side terminal is provided on the rear part of the main body case. On the other hand, in the front part of the body case, terminal fittings are housed in a storage space in the body case, and the storage space communicates with the outside of the body case through a terminal hole that opens to the front of the body case. A load-side terminal is provided that is configured by a quick-connecting terminal that connects the load wiring and the terminal fitting by inserting the load wiring from the terminal hole, and is used in a single-phase three-wire electric circuit. The terminal holes are arranged in a vertical direction on the front surface of the main body case, and the terminal holes are arranged on the side surface of the main body case in a direction parallel to the front surface of the main body case. An extending guide groove is formed, the guide groove divides the terminal hole in the inner and outer directions in the main body case, a plate-like main body that can be inserted into the guide groove, a cover member having a knob spaced apart from the main body by a distance to the front surface of the case and a connecting portion connecting the main body and the knob, inserting the main body into the guide groove; With the knob positioned on the front surface of the main body case, it is slidable along the guide groove, and the cover member is slid to move the main body from the terminal hole in the guide groove. It is characterized in that any one of the terminal holes can be selectively closed by being positioned at the division point.
Further, the invention according to claim 2 is the invention according to claim 1, wherein the front surface of the main body case is provided with an insertion hole into which a measuring terminal of an instrument for conducting an insulation resistance measurement test can be inserted. Each quick-connect terminal is opened near the terminal hole, and the guide groove divides the insertion hole in the inner and outer directions in the main body case, while the main body is connected to the terminal. It is sized so that when it is positioned at the part where the hole is divided, it can also be positioned at the part where the insertion hole corresponding to the terminal hole is divided. It is characterized by being able to close the hole at the same time.
Note that "the terminal holes are arranged vertically" in claim 1 is not limited to arranging them vertically. For example, when the front surface of the main body case is an inclined surface, there is no problem in arranging them vertically along the inclined direction. When arranging them in the vertical direction, they are not limited to arranging them in a straight line in a plan view. You can also arrange them side by side.

According to the present invention, since the cover member slides along the guide groove carved on the side surface of the body case, it is not necessary to provide a slide structure such as a support wall on the front surface of the body case. Therefore, the structure on the front surface of the main body case can be simplified more than before, and the insertion of the load wiring into the terminal hole can be easily performed. Furthermore, since the main body of the cover member for opening and closing the terminal hole is positioned inside the main body case, the cover member can be positioned forwardly of the main body case compared to the case where the main body of the cover member is provided on the front surface of the main body case. The amount of protrusion can be suppressed, and the circuit breaker for wiring can be miniaturized.
Further, according to the second aspect of the invention, the main body of the cover member is sized so as to be able to be positioned at the cut portion of the insertion hole corresponding to the terminal hole when the main body of the cover member is positioned at the cut portion of the terminal hole, The main body can simultaneously close the terminal hole and the insertion hole corresponding to the terminal hole. Therefore, since the terminal hole and the insertion hole can be closed with a single cover member, the structure related to the covering/exposing of the terminal hole and the insertion hole can be simplified more than before, and the circuit breaker for circuit breaker can be used. Further miniaturization can be achieved.

FIG. 2 is a perspective explanatory view showing the circuit breaker for wiring in a state where an output of 200 V is obtained; FIG. 2 is an explanatory diagram showing the circuit breaker for wiring in the same state as in FIG. 1 from the side; It is an explanatory view showing a cover member. FIG. 3 is an explanatory view showing a cross section taken along line AA in FIG. 2; FIG. 4 is an explanatory view showing the inside of the front side of the main body case; FIG. 2 is a perspective explanatory view showing the circuit breaker for wiring in a state where an output of 100 V is obtained;

DESCRIPTION OF THE PREFERRED EMBODIMENTS A wiring breaker according to an embodiment of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective explanatory view showing a circuit breaker 1 for wiring in a state where an output of 200 V is obtained. FIG. 2 is an explanatory view showing the wired circuit breaker 1 in the same state as in FIG. 1 from the side. FIG. 3 is an explanatory diagram showing the cover member 10. As shown in FIG. FIG. 4 is an explanatory diagram showing a cross section taken along line AA in FIG. FIG. 5 is an explanatory view showing the inside of the front side of the body case 4. As shown in FIG. FIG. 6 is a perspective explanatory view showing the circuit breaker for wiring 1 in a state where an output of 100 V is obtained. Note that the load terminal 3 side will be described as the front side of the circuit breaker 1 for wiring.

A circuit breaker 1 for wiring used in a single-phase three-wire electric circuit has a body case 4 formed by assembling a left case 4a and a right case 4b made of synthetic resin. 7 is provided so as to be rotatable in the front-rear direction. By rotating the handle 7, a cutoff mechanism (not shown) incorporated in the main body case 4 is activated, and an electric circuit that electrically connects the power supply side terminal 2 and the load side terminal 3, which will be described later, is connected/connected. It is designed to be open. An overcurrent detection mechanism (not shown) is also provided in the body case 4, and when an overcurrent is detected, the breaking mechanism opens.

Further, on the rear surface of the circuit breaker 1 for wiring, there is arranged a power source side terminal 2 having plug-in type terminals P1, P2, and P3 arranged vertically in a row. Each of the terminals P1 to P3 is formed by notching the main body case 4 in the left-right direction in a U-shape. A branch bar (not shown) branched from the conductor bar can be inserted and connected.

On the other hand, the front surface of the circuit breaker 1 for wiring is formed on an inclined surface that slopes down toward the front side, and the inclined surface has three terminals L1 and L2 into which load wiring (not shown) can be inserted and connected. , L3 arranged in a row in the direction of inclination. Each of the terminals L1 to L3 is open on the front surface of the main body case 4, the terminal hole 5 into which the load wiring can be inserted in the direction perpendicular to the inclination direction of the front surface of the main body case 4, and the inner side of the terminal hole 5 in the main body case 4. A storage space 21 is provided at a position and communicates with the outside of the main body case 4 through the terminal hole 5, and a load wiring is installed in the storage space 21 and is made contactable with the load wiring inserted through the terminal hole 5. It has a terminal fitting 8 and functions as a so-called quick connection terminal. Each of the terminals L1 to L3 has an insertion hole 6 adjacent to the upper side of the terminal hole 5 and into which a measuring terminal of an instrument for performing an insulation resistance measurement test can be inserted. Each insertion hole 6 is opened so that the insertion direction of the measuring terminal is in the vertical direction, that is, in a direction different from the insertion direction of the load wiring. are in communication. Further, in the upper part of the storage space 21, a metal fitting 9 for measurement is arranged so that it can come into contact with the load wiring inserted into the terminal hole 5 adjacent to the lower side of the insertion hole 6. As shown in FIG. The front end portion of the measuring fitting 9 is exposed in the insertion hole 6 so that the tip of the measuring terminal inserted into the insertion hole 6 can come into contact therewith.

Furthermore, on the front surface of the circuit breaker 1, the terminal hole 5 and the insertion hole 6 that are not used among the terminals L1 to L3 are closed so that the load wiring can be inserted into the terminal hole 5 and the insertion hole 6 can be used for measurement. A cover member 10 for preventing insertion of a terminal and a guide portion for guiding the sliding of the cover member 10 when changing the closed terminal hole 5 and insertion hole 6 are provided.

Here, the cover member 10 and the guide portion, which are essential parts of the present invention, will be described.
First, the cover member 10 will be described. The cover member 10 includes a plate-like main body 11, a knob 12 positioned forward from the main body 11 at a predetermined distance, and a connecting portion connecting the main body 11 and the knob 12. 13 is a member made of synthetic resin. The main body 11 has a vertically long cover portion 11a and a base portion 11b extending leftward from the center of the cover portion 11a in the vertical direction. The cover portion 11a is a substantially rectangular plate in a front view having a lateral width substantially equal to the diameter of the terminal hole 5 and a vertical length capable of simultaneously closing a set of the terminal hole 5 and the insertion hole 6. Elastic pieces 14 protruding to the left are provided on the upper and lower sides of the base portion 11b at the left edge of the cover portion 11a. Each elastic piece 14 has an inclined posture that gradually inclines rearward toward the left side with respect to the cover portion 11a. It functions as a holding portion that holds on the front side. The knob 12 has a base portion 12b and a knob portion 12a projecting forward from the base portion 12b. The knob 12 is separated forward from the main body 11 by the same distance as the distance from a guide groove 15 to the front surface of the main body case 4 via a connecting portion 13 that connects the base portions 11b and 12b. is provided.

On the other hand, the guide portion has a guide groove 15 engraved on the left side surface of the main body case 4 and extending in an inclined direction parallel to the front surface of the main body case 4, and a locking recess 16 provided in the guide groove 15. It becomes The guide groove 15 is a groove that opens to the left side surface of the main body case 4 (the surface of the left case 4a), and its depth (the depth in the left-right direction) corresponds to the length of the main body 11 of the cover member 10 (the cover portion 11a and the cover portion 11a). , and extends to the inside of the right case 4b. Further, the thickness of the guide groove 15 (thickness in the direction orthogonal to the front surface of the main body case 4 ) is substantially the same as the thickness of the main body 11 . Further, the guide groove 15 is provided inside the main body case 4 by the same length as the length of the connecting portion 13 from the front surface of the main body case 4 in the direction orthogonal to the front surface of the main body case 4, and the terminal holes 5 are provided in the front and rear directions. In addition, each insertion hole 6 is vertically divided (that is, both the terminal hole 5 and the insertion hole 6 are divided in the inner and outer directions of the main body case 4 by the guide groove 15). In addition, on the lower surface of the guide groove 15, a locking recess 16 is formed by recessing the lateral width substantially the same as the lateral length of the elastic pieces 14, 14, and extends in the inclined direction in which the guide groove 15 extends. . The front side of the guide groove 15 on the surface of the left case 4a is recessed by approximately the same thickness as the connecting portion 13 as compared to the rear side of the guide groove 15, as will be described later. When the cover member 10 is attached to the guide portion, the surface of the connecting portion 13 of the cover member 10 and the surface of the left case 4a are substantially flush with each other.

When attaching the cover member 10 to the guide portion, the elastic pieces 14, 14 are positioned in the locking recess 16 and the knob 12 is positioned on the front surface of the main body case 4. The main body 11 (especially the cover portion 11a) of the cover member 10 can be pushed into the guide groove 15 through the opening. As the elastic pieces 14 and 14 are pushed in, the elastic pieces 14 and 14 change their postures to substantially parallel to the main body 11 , but return to the tilted posture when they reach the locking recesses 16 . Then, the tips of the elastic pieces 14, 14 and the step between the guide groove 15 and the engaging recess 16 face each other, thereby preventing the main body 11 from slipping out of the guide groove 15 and allowing the cover member 10 to move toward the guide portion. Installation is completed.

Further, when the cover member 10 attached as described above is operated upward or downward in the inclined direction, the body 11 moves inside the guide groove 15 while the elastic pieces 14, 14 remain positioned in the locking recess 16. By sliding upward or downward, the position of the cover member 10 on the front side of the body case 4 can be arbitrarily changed.

In the wiring breaker 1 as described above, the output voltage is switched as follows. First, in the power supply side terminals 2, the upper terminal P1 is a neutral connection terminal, and the lower two terminals P2 and P3 are voltage terminals. On the other hand, among the load-side terminals 3, the center terminal L2 is used as a neutral line connection terminal, and when a load wiring is connected between the terminals L1-L3 of the load-side terminals 3, an output of 200 V can be obtained. It is possible. Therefore, if it is desired to obtain an output of 200 V, the position of the cover member 10 should be such that the knob 12 is on the left side of the terminal L2 (FIG. 1). Then, the cover portion 11a of the cover member 10 is positioned in the terminal hole 5 and the insertion hole 6 corresponding to the terminal L2, and the terminal hole 5 and the insertion hole 6 are closed. Therefore, it is possible to prevent the insertion of the load wiring into the terminal hole 5 and the insertion of the measuring instrument into the insertion hole 6 for the terminal L2.

On the other hand, when a load wiring is connected to terminals L1-L2 or terminals L2-L3 of the load side terminals 3, an output of 100 V can be obtained. Therefore, if it is desired to obtain an output of 100 V, for example, the position of the cover member 10 should be such that the knob 12 is on the left side of the terminal L3 (FIG. 6). Therefore, if the cover member 10 is positioned as shown in FIG. 1, the cover member 10 is moved downward in the tilt direction. Then, the cover portion 11a of the cover member 10 is positioned in the terminal hole 5 and the insertion hole 6 corresponding to the terminal L3, and the terminal hole 5 and the insertion hole 6 are closed.

According to the circuit breaker 1 having the configuration described above, the left side surface of the body case 4 is provided with a guide groove 15 extending in an inclined direction parallel to the front surface of the body case 4, and the guide groove 15 In the body case 4, each terminal hole 5 is divided into front and rear portions. On the other hand, a plate-shaped main body 11 that can be inserted into a guide groove 15, a knob 12 provided apart from the main body 11 by the distance from the guide groove 15 to the front surface of the main body case 4, and the main body 11 and the knob 12 are separated. A cover member 10 having a connecting portion 13 is provided, and the cover member 10 is guided by inserting the main body 11 into the guide groove 15 and positioning the knob 12 on the front surface of the main body case 4. It was attached slidably along the groove 15 . Then, by sliding the cover member 10 and positioning the main body 11 at the part where the terminal hole 5 is divided in the guide groove 15, the three terminal holes 5, 5 provided corresponding to each of the terminals L1 to L3 are opened. Any one of . . . can be selectively closed. Therefore, the structure on the front surface of the main body case 4 can be simplified as compared with the conventional one, and the insertion of the load wiring into the terminal hole 5 can be easily performed. Furthermore, since the main body 11 of the cover member 10 for opening and closing the terminal holes 5, 5 . . . As a result, the amount of protrusion of the cover member 10 toward the front side of the main body case 4 can be suppressed, and the size of the circuit breaker 1 for wiring can be reduced.

In addition, the main body 11 of the cover member 10 is sized so that when the main body 11 of the cover member 10 is positioned at the cut-off portion of the terminal hole 5 , it can be positioned at the cut-off portion of the insertion hole 6 corresponding to the terminal hole 5 . and the insertion hole 6 corresponding to the terminal hole 5 can be closed at the same time. Therefore, since the terminal hole 5 and the insertion hole 6 can be closed with a single cover member 10, the structure for covering/exposing the terminal hole 5 and the insertion hole 6 can be simplified more than the conventional structure. Further miniaturization of circuit breaker 1 for wiring can be achieved.

Further, the main body 11 is provided with elastic pieces 14, 14 inclined in a predetermined direction with respect to the main body 11, and a guide groove 15 is provided with a locking recess 16 into which the elastic pieces 14, 14 in an inclined posture can be inserted. The main body 11 is prevented from slipping out of the guide groove 15 by the steps of the guide groove 15 and the locking recess 16 facing each other. Therefore, it is possible to prevent the cover member 10 from accidentally falling off, and since the structure for preventing the falling off is provided inside the main body case 4, the structure on the front surface of the main body case 4 is further simplified. can be achieved, and further miniaturization of the circuit breaker 1 for wiring can be achieved.

It should be noted that the configuration of the circuit breaker for wiring of the present invention is not limited to the aspect of the above-described embodiment. The configuration and the like can also be appropriately changed as necessary without departing from the gist of the present invention.

For example, in the above-described embodiment, the front surface of the main body case is an inclined surface, but it may be a vertical surface, and load-side terminals having a terminal hole in such a vertical surface, for example, a terminal hole for inserting a load wiring toward the rear. can also be provided.
In addition, in arranging the terminal holes in the vertical direction on the front surface of the body case, the terminals are arranged in a straight line in plan view in the above-described embodiment, but the terminals are arranged in an oblique direction such as gradually moving from the left to the right on the front surface of the body case. The holes may be aligned, or only the central terminal hole may be shifted to the right. By doing so, the thickness of the main body case in the left-right width direction is increased, but the visibility of the load-side terminals can be improved.

Furthermore, in the above embodiment, the insertion holes are formed so that the direction of insertion of the measurement terminals into the insertion holes is different from the direction of insertion of the load wiring into the terminal holes. may be the same direction as the insertion direction of
Furthermore, in the above embodiment, both the terminal hole and the insertion hole are opened and closed by the cover member. You may make it

Furthermore, in the above embodiment, the guide groove is formed on the left side of the main body case, but it goes without saying that it is possible to carve the guide groove on the right side of the main body case, and the guide groove of the cover member. It is also possible to appropriately change the design of the structure related to the prevention from coming off.
In addition, in the above embodiment, the terminals P1 and L2 are neutral poles, but which terminals are neutral poles can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1... Circuit breaker for wiring, 2... Power supply side terminal, 3... Load side terminal, 4... Main body case, 5... Terminal hole, 6... Insertion hole, 7... Handle, 10... Cover Member 11 Main body 11a Cover portion 11b Base portion 12 Knob 12a Knob portion 12b Base portion 13 Connecting portion 14 Elastic piece 15 - Guide groove, 16... Retaining concave part, 21... Storage space.

Claims (2)

A handle for opening and closing the electric circuit is provided on the upper surface of the main body case, and a power supply side terminal is provided at the rear of the main body case. The housing space communicates with the outside of the main body case through a terminal hole that opens to the front surface of the main body case, and the load wiring and the terminal are connected by inserting the load wiring through the terminal hole. A circuit breaker for wiring that is provided with a load-side terminal configured by a quick-connection terminal to which a metal fitting is connected and is usable for a single-phase three-wire electric circuit,
The terminal holes are arranged in a vertical direction on the front surface of the main body case, and guide grooves extending in a direction parallel to the front surface of the main body case are formed on the side surfaces of the main body case. , while the terminal hole is divided in the inner and outer directions in the main body case,
A plate-shaped main body that can be inserted into the guide groove, a knob that is separated from the main body by a distance from the guide groove to the front surface of the main body case, and a connecting portion that connects the main body and the knob. is provided slidably along the guide groove with the main body inserted into the guide groove and the knob positioned on the front surface of the main body case,
Any one of the terminal holes can be selectively closed by sliding the cover member and positioning the main body in the guide groove at the part where the terminal holes are divided. Circuit breaker for wiring. An insertion hole into which a measuring terminal of an instrument for conducting an insulation resistance measurement test can be inserted is formed on the front surface of the main body case in the vicinity of the terminal hole corresponding to each of the quick-connecting terminals, While the insertion hole is divided in the inner and outer directions in the main body case by the guide groove,
The main body is sized so that when it is positioned at the part where the terminal hole is divided, it can also be positioned at the part where the insertion hole corresponding to the terminal hole is divided,
2. The circuit breaker for wiring according to claim 1, wherein the terminal hole and the insertion hole corresponding to the terminal hole can be simultaneously blocked by the main body.

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